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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a5179c7d8ece04c3bcc042f401a4aeae45ea4be855f4c9532d35dc8c4a2e08' 
  AND token = 'OK5r09Frvq5MMObwcS+Sme9LgOjR7EXoxZEzxQqTE2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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