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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed90523f22d904eeace365573f5795c03bc818a732ab4ae4d40251b7a7e6186' 
  AND token = 'M7G7V1CJ0bre2fqP1LBeMmgPfGZiOeLcxqyZ4wD1Zn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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