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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7dff69e9a6fff1bee26e79add75e07d550d98effc3b999cda54329e16cf62d' 
  AND token = 'AdWlYJFmzpk2cmfgLf8o6SBqknQQWqwAJz/ZPPlgzpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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