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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7887648881983a7fcec00ca50f9b42570f4d5ec70295d5c37b62979ad2766da5' 
  AND token = 'wj2pjjZMFN3x3wXXTS7DqHDedOcRqDwjqUhryjvcjnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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