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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9007322d7ac8203a48469f752ad6adf00c5a60a500c43b8df557db38ab9896' 
  AND token = 'YfHbAVX6vrHHKE8ANrNnZCz/8YT3UzZauo0LKmnvsHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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