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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a953fe1a2e557325f0987214a1ad43896b0bc96165ea672c0c36263c8d2b72dc' 
  AND token = 'hV7Mu182UZTOzC8TU1QIi5eFjVdHcA3sjG6l5qTZqKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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