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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fa9163c720be084a881c35cbd873ffd6629470fceb224cdc7f5c9d420f0851' 
  AND token = 'c5uzpjAnCorRAK5sPuAhIfmPorgV7HjE5j3t3LvaLBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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