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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e9e4dbd7a0ae928177b1839484ca0321916292e2e51f4cb9060b7c742435aa' 
  AND token = 'oh0s66gung16xqenv7+V/iR9jwjgbIXOXOYYWRv+Ixs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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