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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468e3e1ffa395bae6ba432a71724339f5a47c6f9c02e47065a2db5c672c882e7' 
  AND token = 'M+hqYV7Q48M5LauZVQrV6gZn9og1QMtf1RngX5jUrik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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