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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dab459b02c435d452d9d7bdc34a696d8e45f93cef826fbbffd8dfb7a62b5209' 
  AND token = '3d1mmWyMZgAzQ7JzOWQ7w0RGoXM7GAWH3++n/6fyecA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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