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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fba371d17a284c8d0aa8af3b1724eada8df52a2b7994afd07d580ffff2e2c7' 
  AND token = '0z4ZObuEH8Muu092YKJoqHONc1FQfXePnET/XYsgmSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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