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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9493627b34095ee43f4d5cbf03d17381561484b2e0a2cb2faec4b5041a9219b' 
  AND token = 'rJArNWTNen8JQ8LxfuQZfgb0S/0KIG0pZfOgOaS+m88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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