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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99fbd8a80ddbf6ca59d322a2307f8e43b35577aa8225bd82e6956171aefe429' 
  AND token = 'Ef/PVFWEzNlDQDc5Cu6gxn+l8xPkMb5eO9mZ/OB34jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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