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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd442325a85de31b8c4e300de0fa48d2c7305dcd770916ef0032d96f637fadf68' 
  AND token = '18RaYKoqFjJHNc8Wv5yRqXD+Vry0qrvQf8LD5PhAblk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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