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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df10bd3a829554d7614dd1c5a283ba3ba092f3bf744470ef22faecac7b37ea6' 
  AND token = 'DZGt8QN2AgRr4tnbTv26Vf/f6dbIzMsfTROI4Zf8F20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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