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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c8e9958246eb740efd15c4a408ab87e9f0e3457250fd38b7436554467fc3ce' 
  AND token = 'ZUnLP8QzViAsUygmUlOLeL9n5JuGD4zk5aCHNFZcuak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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