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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe75797fbfe4de50a5473f8f2feac709b49d0fd0b0b264ee07d7579540070cc9' 
  AND token = '6WQPPg+OfUFWeNaN/j6P1MtmDOyehK0DwwTUy1gHco8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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