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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afe3a84106d2d399fb50ab5e5007bf7eacb24d0f4f3cbc1be6de250a3c8589f' 
  AND token = '3eVFnFlvsRdok5tH85X8DCR4bJEmGrn3AyWukO07CMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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