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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85a447377022973b92995a9ed34461ea581e0ec3eeb8284530e0d7e6bf14ce7' 
  AND token = 'A3qPm52mRJrlyqiNirA9OnVH5W2h5agYPOSqpoisyRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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