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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f940d7f5f106494e81d0cd4b8088d6a96048604994bd00ea23b014031a9136' 
  AND token = '8OcoKZTKRpVCGUrdoTpbDAH8fKIpKXiy4mOGohHJ/GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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