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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f9fbdb0d1f7a49cfccab8bb7830e4e6698b971206ff2487b0ee6a79f7ebb60' 
  AND token = 'RkWY4a88g9NFsgxxDeacD/9C1gXkvxAlhR1JSJHKp5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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