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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e3598747a9075787eb10cc16f36a35e03558aa9d1ad3d3efd0dcd8b000a4bb' 
  AND token = 'Nnu/Cef5soSMz/uoyUuuJRX1jGgTReCCjG+CdKlZ1Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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