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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d86422a59d208a8dc4d3695de1de939df82e49c42abd3fdeae31bde8fc24a3' 
  AND token = '9WGyWFfk7kbyoODWLgTYKXu7vgqGWzB8YmvDVAbOSAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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