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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f40904dbd1eecde8ef4d9ce3ffb0b8567ae5f3c894df7b061b4b76015e11ce9' 
  AND token = 'v2/PlDi4d21d2Uv+U4sc5J0JEL1POxjp7xJpAtS+tiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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