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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915bb9839e3a45a5c74a25ea33fc23b1f7510fc98298563fbf1b7f7572488a2f' 
  AND token = 'kYpDiRl8/FDcrnnw0dk0Dv7RS/3wCM43/2+I/yilxSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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