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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06c51ccb6e306c67d47265940e19790af43d24620ecf989abe11ebb2237677c' 
  AND token = 'PoPuHHmBoGsy3gQpLCWsRtVggUSjWW9VJLeprQ/LFdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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