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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3ba7fbd2061a0a2275bd90d3f8a8e48c1f75c93cbe7c7ec72ad9fd6ce3275a' 
  AND token = 'tFWUnK+hUpq6x7xL+CtbSX5bDJxcMFX+dj7I+0Z2s9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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