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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd2488873d62eb6200716ce81c50e8556f75e500ceeba59c75e87cf73333a7d' 
  AND token = 'ojp5ofX91CMPFkrZN3s3Ve7VIBxGygoSyLALtWptNPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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