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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1dfaa378d5c5fbe3f8ed6bf754b72cbb5df2ff89276155fcec7be54016b8b3' 
  AND token = '4zeqlCD/sMvoJonUm6ajIGdOs9QIiNSyNOhegaXdI98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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