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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc861efaa8a2c9586c1b3483db55725470666284383e0008a814a6be3cd0e87d' 
  AND token = 'YiqYIRzrgjWe86FwnB1kDBXWmpjvNU+jayaHZn8wdYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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