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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8da96a2765701f8d7c3590597a16963b594e4095bb9f7916aec1553280c33b' 
  AND token = 'TtGLsYo1zSKhPEeGitHidVp8UmUaBodGDJnuHMlciuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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