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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f45a40fcc504aa0e54b5c4f8ebf48dcb46ab2e833680bae0d18434cfad3f6a' 
  AND token = '/RhFVrS6moSD/DlNt7K+qrdUgzMy5VeCsgfgoKktQLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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