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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ae5820aaca602f7c92a2bbb7dc171e87f68a2b264336d7231a4669cad3887e' 
  AND token = 'Vth7ZR1OoMIOgXQltQ6PhNejUobaYAu8n6JEnsBbKHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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