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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a62aff0013c1e3cb60f7492dc1b81c30e63a11016b8910a1c8ef8c796f4ebd' 
  AND token = 'qo5G6kEYVrzhkD3t8pBkNXzcdyTaU8mxm9KyePatbOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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