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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e544a4d9ab481b45d01e267f2c2677d31af8f587a94493be42be9e872d531dd' 
  AND token = 'IPu+vbMUHQZtGlEds3ifWJI+a79gtFWxODjT+fEDRW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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