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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3926d427f78ac053a021908be4804f6a8f9d1f97d551d5b015280d3e7886b2d' 
  AND token = '3mQyZeSZF77jsmK8vyAO14OERlJmeDEw9ZKNMgy/MkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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