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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18a749f78b970abc92c605d66c0f1bf61f5df0ba4e5aef3f6818ba3d42d3c74' 
  AND token = 'fnu1b+3/DCuOf5FuRGmKseNbQMIvL7DLjGoL67+1kQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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