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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b832367d2843c002d72ef191cb75beeb95604430f0bbf77e56669e4b66da502' 
  AND token = '8vvP9MumPuVU9KCNPAx3umyff8v5li+9Wfv/XDI0aMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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