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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cefdc29dd09b6ceecd306c4d5faf2f2ccf6d913ca14782feec26a0e65d124e8' 
  AND token = 'O2wSyX2OZUFbJakveUDHwSyiGZce9Gl1KPMuzRMvHWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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