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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cfbf4b94471061ec58b7b7c604c0b44dc196cfd2f1868418f724b47c95ac1a' 
  AND token = 'sixgh4I9OIG3IMrAEq3IenyvrWsSRLygg2hDR3MV49M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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