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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cd480ab07d4caed72f1ddc5e8d00c2c2fb07cd63748c75addddf6450bbb896' 
  AND token = '5KZX7WFIlet0KsBzAc++qqUvsfKSHftWL+8xYpPuF5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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