SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a1c093199bd7d3c2acf155c2dfa0e3ab93740c27c5419fe0464727078523b4' 
  AND token = '2/dqmmPEVAwqJ6Ucb+jjgq1DrLuNKYuMKs1CEjMdgk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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