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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2527a6b04cb026a29b19d17e9ca27ef7ddfa713d2197b8eaa40954dd0be8b77f' 
  AND token = '1jOzIQX9hsROqFFCcaviMwTJAgtdILsDuK1uix+J6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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