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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860f454336e3c3659047959950cb0958e2de0bccdc52e018048bf28647aa6076' 
  AND token = 'EiiWtZksfiXwrVRlnuIhYq4MtI9zTK7YrNSFvnYThP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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