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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a948d5aca784050ae56479254887fe21d7e6c1c74c8aec22597fdc7845c5402c' 
  AND token = 'eebdogYNgppdNkGG1fiP9C7NC4D5MYEYoaE4U72oe9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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