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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43bcfb26046397b5f33f0cdbebd4c851be52a7153d55572c6045e1cd256b2f28' 
  AND token = '0hLIl7s8w4XEClvbfuKtLgqk1RPJnW9utBPJmr5qMu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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