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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e14c62e19c436929524db147218fa1968f73fde73a0e9b439179067a9e25c6f' 
  AND token = 'OSOXv0COzo+In9BOraDpTbdD/Iafg7dbIpNyUWdv2K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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