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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ceca5a8b3832cfef0940713737f82116e1c01bbd0528481c50e6ccbf64702c' 
  AND token = 'rGCl7yF9S/Xjb2FdMIA2vob7lgDxvk14rMkq2pFjqz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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