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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafcf58fb96429c6646aaa6f7337da53b0ae20bc9cb76afe99b5192cce4a9c1a' 
  AND token = 'eSBDyru+2rPvYbzlGUytwpETix2xN/lSL4cYFlUx7WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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