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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cacf304427dda5f8a2b1e9f70ca33e68da35ed32e4e5110277e9bf0e577d441' 
  AND token = 'oeO7KmJyDu+deJ06cNDJdxiH5/bI7GJFuHphqr6DV3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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