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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e4816c438602564f24c2c459437263ba7e469d6de504a27e3b8ee3ce6446b1' 
  AND token = 'TWtFdm/gXKcqGSDWKCrR7BC635v/Zo7SZJNO5V01Ukc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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