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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d737819834af70f2f8f4b50ed261b9205cdcd76206a720f89c0edb3ce2dac58' 
  AND token = '865cvuj1MVwNs2+c249L32S+kGcCrLj+zHxscRUF1Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}