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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba2d9d5b1da827f2f7c313edf18110bf7776157784ee28647b9b8d593942987' 
  AND token = 'eVsKaEIonlX/XHkgMehGzBn+shA4yVV/WoKuaMA8NUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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