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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c848fe13817890244a0c9bb09c27828b5409c9f8e8da5f2ffb942dab1cb52fe' 
  AND token = '0FdLx9cQvKyoGvATBbi/p9obIukYYfq34yJCv5jPA3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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