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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7107c85042995d5b8dfe51854b802a03aab1e4000ff4386936167535dfda9ccf' 
  AND token = '4slP5c56C4BLJVhbthPCaHXmspve09pOQGI76sEG9hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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