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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3c4a66d8b3353b8a63b49b56d545a6436763a0dd3cd7fb718b93d5c4f9ae59' 
  AND token = 'sH9NYzpIdCWV82uUsJYYHCp6Y4ChjjcWkYtQspeI8Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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