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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6082c4c04e3e1afff2a834f60c42323a06f677d4409ba72fea03cf5fc252bbf0' 
  AND token = 'ybtoFJvTZ8wmnnxexmXhNKzwGJ/f2EjzY9OzzWd90vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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