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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798469242d5476682031ec862b5d11972df21ca2188d4959d2818fe7dbc34eb8' 
  AND token = 'F8zb2o9kXFBzrySTrQydrzW1JRU2mmOAnVzOLdopdI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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