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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b9c077fcbeb852fe71dfee09ef7ce57799b7048f275cbfd6dd41c9b778b453' 
  AND token = 'MfO9dpVegjOJYIZZPBpANnW93HRmoBm+ECO4691Dbj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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