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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a32490f814e952c6069e9727f428402a0b7b0cc6c46b88463480e8fc83b466' 
  AND token = 'PEidZ4+LkkcZxMGpp+Ps7XeuyVbmP28X/p6a0aywexg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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