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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b346aa1dc9b8be04c9fd36f3e26888481cf204f7046a48f835939ba691005c12' 
  AND token = '27Rk9ZOxGQ60O5pUmmt5Ym8fYa9dTlvVp7+8HPwOEEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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