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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4136464afd1fc6aa7cf4acb94ffa237aac2ca852c0e17e22e495858a3cbbfbf6' 
  AND token = 'UM5+slRCDka4TnDqZWnwiQyZTe+7/61tvl6YZJE8AxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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