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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb417c0ef6bc8943778f2022395055774f439897f6cf69f130a21700d5190ee9' 
  AND token = 'fFfTtZBbwnJsA5lVEB8XUOMsydsI2GgcoM4c9h4/4IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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